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The time duration from 1am to 10pm is exactly 21 hours, which equals 1260 minutes or 75600 seconds.
1am to 10pm spans 21 hours. This period is during the early morning hours when most people are asleep.
The calculator above automatically sets the times to 1am (01:00) and 10pm (22:00), but you can adjust the date or add seconds for more specific calculations.